Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754736AbdDJPzR (ORCPT ); Mon, 10 Apr 2017 11:55:17 -0400 Received: from mx2.suse.de ([195.135.220.15]:37866 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754412AbdDJPea (ORCPT ); Mon, 10 Apr 2017 11:34:30 -0400 X-Amavis-Alert: BAD HEADER SECTION, Duplicate header field: "References" From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Johan Hovold , Dmitry Torokhov , Jiri Slaby Subject: [PATCH 3.12 076/142] Input: hanwang - validate number of endpoints before using them Date: Mon, 10 Apr 2017 17:32:37 +0200 Message-Id: <006c02072edb31b1a0668946a93d425fffba61c9.1491838390.git.jslaby@suse.cz> X-Mailer: git-send-email 2.12.2 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1134 Lines: 35 From: Johan Hovold 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit ba340d7b83703768ce566f53f857543359aa1b98 upstream. Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints. Fixes: bba5394ad3bd ("Input: add support for Hanwang tablets") Signed-off-by: Johan Hovold Signed-off-by: Dmitry Torokhov Signed-off-by: Jiri Slaby --- drivers/input/tablet/hanwang.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/input/tablet/hanwang.c b/drivers/input/tablet/hanwang.c index 5cc04124995c..263c85e72e14 100644 --- a/drivers/input/tablet/hanwang.c +++ b/drivers/input/tablet/hanwang.c @@ -341,6 +341,9 @@ static int hanwang_probe(struct usb_interface *intf, const struct usb_device_id int error; int i; + if (intf->cur_altsetting->desc.bNumEndpoints < 1) + return -ENODEV; + hanwang = kzalloc(sizeof(struct hanwang), GFP_KERNEL); input_dev = input_allocate_device(); if (!hanwang || !input_dev) { -- 2.12.2